Favor partial fractions in manualintegrate
Favor substitution over expansion in manualintegrate
Add trig substitutions for manualintegrate (WIP)
Implement asin, asinh, acosh rules for manualintegrate
Add trig substitution rule to manualintegrate
manualintegrate: Don't use trigsub if result cannot be evaluated
Merge pull request #2712 from lidavidm/manualintegrate_improvements

Manualintegrate improvements